First of all, thanks a lot for helping me! Great forum with great people!
The problem is solved.
I just installed them one by one
Actually I first installed the last update in the row (KB2732500:Update voor Windows 7 voor x64-system).
Then I figured it would take a while for 8 updates to install one by one so I took the 3 last updates in the row, again, success!
And after the reboot I did the 4 remaining updates and they installed also successful.
Again thanks a lot for the help